In 2019, for the first time ever, a black hole was imaged. The object itself is completely dark since even light can't escape from it. However, the black hole's boundary – the event horizon – casts a shadow, and that's what we see in the photograph.
The image was achieved with data from the Event Horizon Telescope (EHT), a global network of eight radio telescopes synchronized by atomic clocks. A supercomputer turned their data into an image. [Photo: EHT.]
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